As Sibze said, all the inserts for the ZL1 (both 5th and 6th gens) are carbon fiber. The exposed version is an additional option because the weave is exposed and visible so extreme care is taken to make sure the weave in the carbon fiber is neat and even.
Be glad you have a 6th gen. The exposed insert for the 5th gen is in the neighborhood of $4000.00 or so.
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